While classical sounds great, I’ve never been a classical music guy. Some songs that stood out to me were

Brave Soul - Illenium

Stargazing - Kygo

Walk me home - Said the sky

Taste like cigarettes - Masked man

Fire Stone - Kygo

Falling in love - Dennis Kruissen

Snow - Masked man

Wishing on You - City girl

Let me know if any of those scratches your itch!

That’s a tough question. But all Honesty, I’ve sold both, and missed the 660s way more.I rebought it faster. The only reason I have the hd600 was because I found it for an incredible price

Sennheiser HD800/HD8XX/HD800s. Extremely light clamp force but strong enough to not fall out when shaking. And plenty of room for your ears practically to never touch the inside of the cup.

Hd600 and hd660s for Lo-Fi pop and general EDM. 600 for vocals and 660s for details :)

Same reason I have had so many airsoft guns. Sure one can do the job, but it’s fun buying and selling them and getting to try different ones out along the way